CN104846171A - Hydrogen plasma generator for annealing and reduction of electrical steel and reduction method thereof - Google Patents
Hydrogen plasma generator for annealing and reduction of electrical steel and reduction method thereof Download PDFInfo
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- CN104846171A CN104846171A CN201510306712.0A CN201510306712A CN104846171A CN 104846171 A CN104846171 A CN 104846171A CN 201510306712 A CN201510306712 A CN 201510306712A CN 104846171 A CN104846171 A CN 104846171A
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Abstract
The invention discloses a hydrogen plasma generator for annealing and reduction of electrical steel and a reduction method thereof. The hydrogen plasma generator comprises a shell (1), a conductive rod (2) and a conductive electrode (3), wherein the shell (1) is internally provided with a cavity, the upper part of the shell (1) is provided with a gas outlet (11); the lower part of the shell (1) is provided with a dielectric gas inlet (6) by which hydrogen gas is fed; the upper part of the shell (1) is made of a conductive material and used as a discharge electrode (4), and the discharge electrode (4) is connected with one end of a power supply; the conductive rod (2) is arranged in cavity of the shell (1), and the conductive rod (2) is connected with the other end of the power supply; and the conductive electrode (3) is arranged in the cavity of the shell (1), one end of the conductive electrode (3) is connected with the conductive rod (2), and the other end of the conductive electrode (3) is opposite to the discharge electrode (4). Generated hydrogen plasmas highly reduce oxides on the surface of the electrical steel, so that the formation of surface fine grains and the attenuation of internal oxidation are avoided in the process of electrical steel recrystallization; therefore, the magnetic performance of annealed electrical steel is better.
Description
Technical field
The invention belongs to electrical steel treatment facility technical field, particularly relate to a kind of electrical steel annealing reduction hydrogen plasma generator and method of reducing thereof
Background technology
In the production process of modern cold rolled metal thin band material, coils of hot-rolled steel is by the surface of pickling, cold rolling acquisition metal true qualities and high dimensional accuracy.Steel band intensity after cold rolling is too high, plasticity is too low, and other performance is non-constant also, such as magnetic property.
Steel band dimensional precision after cold rolling is high, surface quality good.If the cold rolled strip that the intensity of acquisition, plasticity are suitable and magnetic property is good, need to be solved by the mode of annealing.
The cold rolled strip annealing of high efficiency is the recrystallize carrying out annealing and completing cold roller and deformed fibrous tissue in continuous annealing furnace.Steel band is elevated to the annealing temperature of requirement from room temperature, and in order to save the energy, the entrance of continuous annealing furnace adopts used heat pre-heating temperature elevation, then open firing, then heats under protective atmosphere, enters soaking zone afterwards.Protective atmosphere heating and soaking all complete in containing the atmosphere of hydrogen.The effect of hydrogen is the reduction after anti-oxidation and low-level oxidation.
In continuous annealing furnace, in protective atmosphere, the content of hydrogen is kind according to annealing steel, the degree of oxidation of steel band is determined after heating.Under generally wishing the requirement that hydrogen content meets technique subsequently after meeting steel strip surface reduction and product performance condition, keep low content.Because the price of hydrogen is high, can blast when conditions permit.Such as: 1) general carbon steel is when adopting open firing in order to reduce, and the highest hydrogen content is 10 ~ 25%; 2) in order to reduce when general carbon steel whole process adopts protective atmosphere to heat, the highest hydrogen content is 4 ~ 10%; 3) content of silicon and aluminum < 2% in electrical steel steel, in protective atmosphere, hydrogen content is about 25%.Content of silicon and aluminum > 2%, in protective atmosphere, hydrogen content is 45 ~ 100%.
Because silicone content in the chemical composition of electrical steel is high, aluminium content is also high.Silicone content the highest can > 3.2%, silicone content are the highest can > 1.0%, Silicified breccias is at high temperature the element being very easy to oxidation, and oxide compound is very difficult to reduction.Especially high silicon and high alumina electrical steel, a large amount of, the fine inner oxide thin layer when reducing not enough under aluminium formation upper layer.
In electrical steel magnetic property and cold rolled annealed process, recrystal grain size and orientation have relation.After annealing, crystal grain is large, iron loss is low, and magnetic property is good; After annealing, { 100} plane texture content is high, and iron loss is low, magnetic strength is high, and magnetic property is good for crystal grain.
In the cold rolled annealed heat-processed of electrical steel, because low-temperature steel belt surface is always with moisture moisture film.Although moisture film is very thin, due to the gasification of temperature-rise period, water (oxygen) content in protective atmosphere reduces very difficult.There is the atmosphere of entrance and exit in continuous annealing furnace, the installation position of radiator tube, furnace roller, instrument etc. all can exchange with air, and in protective atmosphere, oxygen level reduces very difficult.
Oxidation in electrical steel heating, annealing process, mainly occurs in heating zone.Then hydrogen reducing is relied at soaking zone.Steel band is in the later stage of heating, and temperature is very high, although surface is still oxidized in protective atmosphere, surface oxidation affects recrystal grain size and favorable texture content.
Electrical steel content of silicon and aluminum > 3.5%, in order to obtain iron loss very, cold rolled annealed whole process adopts the method and mode that in the indirect heating of protective atmosphere and protective atmosphere, hydrogen richness is very high.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly makes hydrogen plasma under the high temperature conditions, improve reduction rate and the ability of hydrogen, by electrical steel cold rolled annealed heating zone, oxide skin is reduced, improve the magnetic property of annealing electrical steel and electrical steel annealing reduction hydrogen plasma generator and the method for reducing thereof of surface quality.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of electrical steel annealing reduction hydrogen plasma generator, has:
Inside has the housing of cavity, and wherein, housing upper is provided with pneumatic outlet; Lower housing portion is provided with the medium-gas entrance that can pass into hydrogen; Housing upper material is conductive material, and as discharge electrode, discharge electrode is connected with power supply one end;
Be arranged on the current conducting rod in the cavity of described housing, described current conducting rod is connected with the power supply the other end;
Be arranged on the conductive electrode that cavity is interior, one end connects with current conducting rod, the other end is relative with discharge electrode of described housing.
The cross section of described housing and housing cavity body is trapezoidal, and two sidewalls as trapezoidal waist are made up of upper and lower two parts, and top is discharge electrode, and bottom is isolation material.
Described current conducting rod is positioned at the bottom of the cavity of housing, and is positioned at the middle part in case width direction; Current conducting rod is arranged along shell length direction.
Described conductive electrode has two at least, is uniformly distributed at described current conducting rod length direction; Bottom described conductive electrode vertical shell and vertical described current conducting rod.
Described pneumatic outlet is rectangle, and length is not less than the width of electrical steel steel band.
Described conductive electrode cross section is circular or regular polygon.
Described housing cross-sectional is rectangle.
A method of reducing for above-mentioned electrical steel annealing reduction hydrogen plasma generator, comprises the steps:
1) steel band is when entering annealing furnace, is heated to annealing temperature in the heating zone of annealing furnace;
2) when steel band moves to plasma generator position, in the cavity of housing, hydrogen is passed into from medium-gas entrance, conductive electrode and discharge electrode electric discharge make hydrogen plasma, hydrogen plasma sprays from pneumatic outlet, be ejected on steel band, strong reducing property hydrogen plasma reduces to electrical steel oxide on surface;
3) after steel band leaves plasma generator, when leaving soaking zone, temperature of steel strips is close to furnace temperature.
A technical scheme tool in technique scheme has the following advantages or beneficial effect, with regard to the reduction of the oxide on surface in electrical steel continuous annealing production line, adopts and arranges hydrogen gas plasma producer at the back segment of protective atmosphere heating or the first section of soaking zone.Plasma generator adopts hydrogen as working medium, and hydrogen becomes plasma body by plasma generator.The hydrogen plasma that plasma generator is produced is directly injected on the electrical steel strip that heated, by the reduction of strong reducing property hydrogen plasma to electrical steel oxide on surface, make electrical steel recrystallization process avoid the formation of surface fine grain and internal oxidition weakens, thus make the magnetic property of annealing electrical steel more excellent.The hydrogen plasma that using plasma producer is produced is to the fast restore of electrical steel oxide on surface, and after making annealing, the blue bands of steel band significantly alleviates.
Accompanying drawing explanation
The structural representation of electrical steel annealing reduction hydrogen plasma generator of Fig. 1 for providing in the embodiment of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
Mark in above-mentioned figure is: 1, housing, and 11, pneumatic outlet, 2, current conducting rod, 3, conductive electrode, 4, discharge electrode, 5, insulation division, 6, medium-gas entrance.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
See Fig. 1, a kind of electrical steel annealing reduction hydrogen plasma generator, has:
Inside has the housing 1 of cavity, and wherein, housing 1 top is provided with pneumatic outlet 11; Housing 1 bottom is provided with the medium-gas entrance 6 that can pass into hydrogen; Housing 1 top material is conductive material, and as discharge electrode 4, discharge electrode 4 is connected with power supply one end; Be arranged on the soaking zone of annealing furnace, operating ambient temperature more than 800 DEG C.
Be arranged on the current conducting rod 2 in the cavity of housing 1, current conducting rod 2 is connected to another pole with power supply outside body of heater, with heat-resisting, electro-conductive material manufacture, such as: carbon silicon rod (SiC), graphite, W or Mo rod etc.
Be arranged on the conductive electrode 3 that cavity is interior, one end connects with current conducting rod 2, the other end is relative with discharge electrode 4 of housing 1.
The cross section of housing 1 and housing 1 inner chamber body is trapezoidal, and two sidewalls as trapezoidal waist are made up of upper and lower two parts, and top is discharge electrode 4, manufacture with the electro-conductive material of resistance to thermal conducting, such as: the manufacture such as graphite, silicon carbide, be connected to outside body of heater, then connect a pole of power supply.Bottom is fireinsulation material, keeps enough refractoriness and electrical isolation, ensures that arc-over is limited between discharge electrode 4 and conductive electrode 3.
Current conducting rod 2 is positioned at the bottom of the cavity of housing 1, and is positioned at the middle part of housing 1 width; Current conducting rod 2 is arranged along housing 1 length direction.
Conductive electrode 3 has two at least, is uniformly distributed at current conducting rod 2 length direction; Bottom conductive electrode 3 vertical shell 1 and vertical conduction rod 2.Conductive electrode 3 quantity is determined according to the maximum width of annealed band.Conductive electrode 3 is the parts forming conduction, electric arc, and hydrogen is plasmarized at this.Shape is circular or multiangular, and material is identical with current conducting rod 2, and quantity meets annealed sheet steel width.Can be fabricated to one with conductive electrode 3, also can be separately, then be installed on conductive electrode 3.
Pneumatic outlet 11 is rectangle, and length is not less than the width of electrical steel steel band.Width is the concentration degree ensureing hydrogen plasma flow and hydrogen plasma ejection.Length is that satisfied annealing electrical steel steel belt plate is wide, makes the whole width of annealed band all have enough hydrogen plasmas to cover and realize reduction to the surface be oxidized.
Conductive electrode 3 cross section is circular or regular polygon.
Housing 1 cross section also can be rectangle.
Hydrogen enters from medium-gas entrance 6, relies on the arc-over formed between conductive electrode 3 and electric discharge, makes hydrogen plasma.Discharge from pneumatic outlet 11 after hydrogen plasma, spray to annealed band surface.
Electricity loop is: the power supply outside the hydrogen plasma → discharge electrode 4 → stove of the power supply outside stove → current conducting rod 2 → conductive electrode 3 → conductive electrode 3 and discharge electrode 4 arc-over.
Embodiment two
A method of reducing for above-mentioned electrical steel annealing reduction hydrogen plasma generator, comprises the steps:
1) steel band is when entering annealing furnace, is heated to annealing temperature in the heating zone of annealing furnace;
2) when steel band moves to plasma generator position, in the cavity of housing 1, hydrogen is passed into from medium-gas entrance 6, conductive electrode 3 and discharge electrode 4 electric discharge make hydrogen plasma, hydrogen plasma sprays from pneumatic outlet 11, be ejected on steel band, strong reducing property hydrogen plasma reduces to electrical steel oxide on surface;
3) after steel band leaves plasma generator, when leaving soaking zone, temperature of steel strips is close to furnace temperature.
After adopting above-mentioned scheme, with regard to the reduction of the oxide on surface in electrical steel continuous annealing production line, adopt and hydrogen gas plasma producer is set at the back segment of protective atmosphere heating or the first section of soaking zone.Plasma generator adopts hydrogen as working medium, and hydrogen becomes plasma body by plasma generator.The hydrogen plasma that plasma generator is produced is directly injected on the electrical steel strip that heated, by the reduction of strong reducing property hydrogen plasma to electrical steel oxide on surface, make electrical steel recrystallization process avoid the formation of surface fine grain and internal oxidition weakens, thus make the magnetic property of annealing electrical steel more excellent.The hydrogen plasma that using plasma producer is produced is to the fast restore of electrical steel oxide on surface, and after making annealing, the blue bands of steel band significantly alleviates.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (8)
1. an electrical steel annealing reduction hydrogen plasma generator, is characterized in that having:
Inside has the housing (1) of cavity, and wherein, housing (1) top is provided with pneumatic outlet (11); Housing (1) bottom is provided with the medium-gas entrance (6) that can pass into hydrogen; Housing (1) top material is conductive material, and as discharge electrode (4), discharge electrode (4) is connected with power supply one end;
Be arranged on the current conducting rod (2) in the cavity of described housing (1), described current conducting rod (2) is connected with the power supply the other end;
Be arranged on the conductive electrode (3) that cavity is interior, one end connects with current conducting rod (2), the other end is relative with discharge electrode (4) of described housing (1).
2. electrical steel annealing reduction hydrogen plasma generator as claimed in claim 1, it is characterized in that, the cross section of described housing (1) and housing (1) inner chamber body is trapezoidal, two sidewalls as trapezoidal waist are made up of upper and lower two parts, top is discharge electrode (4), and bottom is isolation material.
3. electrical steel annealing reduction hydrogen plasma generator as claimed in claim 2, it is characterized in that, described current conducting rod (2) is positioned at the bottom of the cavity of housing (1), and is positioned at the middle part of housing (1) width; Current conducting rod (2) is arranged along housing (1) length direction.
4. electrical steel annealing reduction hydrogen plasma generator as claimed in claim 3, it is characterized in that, described conductive electrode (3) has two at least, is uniformly distributed at described current conducting rod (2) length direction; Described conductive electrode (3) vertical shell (1) bottom and vertical described current conducting rod (2).
5. electrical steel annealing reduction hydrogen plasma generator as claimed in claim 4, it is characterized in that, described pneumatic outlet (11) is rectangle, and length is not less than the width of electrical steel steel band.
6. electrical steel annealing reduction hydrogen plasma generator as claimed in claim 5, it is characterized in that, described conductive electrode (3) cross section is circular or regular polygon.
7. electrical steel annealing reduction hydrogen plasma generator as claimed in claim 1, it is characterized in that, described housing (1) cross section is rectangle.
8. a method of reducing for the electrical steel annealing reduction hydrogen plasma generator as described in as arbitrary in claim 1-7, is characterized in that, comprise the steps:
1) steel band is when entering annealing furnace, is heated to annealing temperature in the heating zone of annealing furnace;
2) when steel band moves to plasma generator position, in the cavity of housing (1), hydrogen is passed into from medium-gas entrance (6), conductive electrode (3) and discharge electrode (4) electric discharge make hydrogen plasma, hydrogen plasma sprays from pneumatic outlet (11), be ejected on steel band, strong reducing property hydrogen plasma reduces to electrical steel oxide on surface;
3) after steel band leaves plasma generator, when leaving soaking zone, temperature of steel strips is close to furnace temperature.
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| CN201510306712.0A CN104846171A (en) | 2015-06-04 | 2015-06-04 | Hydrogen plasma generator for annealing and reduction of electrical steel and reduction method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06346138A (en) * | 1993-06-07 | 1994-12-20 | Nippon Steel Corp | Reduction heat treatment method of metallic material |
| US20080149226A1 (en) * | 2006-12-26 | 2008-06-26 | Karen Anne Connery | Method of optimizing an oxygen free heat treating process |
| CN101227790A (en) * | 2008-01-25 | 2008-07-23 | 华中科技大学 | Plasma jet apparatus |
| CN101326863A (en) * | 2006-03-16 | 2008-12-17 | 赖茵豪森机械制造公司 | Apparatus for producing a plasma jet |
| CN204779700U (en) * | 2015-06-04 | 2015-11-18 | 马钢(集团)控股有限公司 | Hydrogen plasma generating device is used in electrical sheet annealing reduction |
-
2015
- 2015-06-04 CN CN201510306712.0A patent/CN104846171A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06346138A (en) * | 1993-06-07 | 1994-12-20 | Nippon Steel Corp | Reduction heat treatment method of metallic material |
| CN101326863A (en) * | 2006-03-16 | 2008-12-17 | 赖茵豪森机械制造公司 | Apparatus for producing a plasma jet |
| US20080149226A1 (en) * | 2006-12-26 | 2008-06-26 | Karen Anne Connery | Method of optimizing an oxygen free heat treating process |
| CN101227790A (en) * | 2008-01-25 | 2008-07-23 | 华中科技大学 | Plasma jet apparatus |
| CN204779700U (en) * | 2015-06-04 | 2015-11-18 | 马钢(集团)控股有限公司 | Hydrogen plasma generating device is used in electrical sheet annealing reduction |
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Application publication date: 20150819 |
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